US9000991B2 - Antenna assemblies including dipole elements and Vivaldi elements - Google Patents

Antenna assemblies including dipole elements and Vivaldi elements Download PDF

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Publication number
US9000991B2
US9000991B2 US13/686,053 US201213686053A US9000991B2 US 9000991 B2 US9000991 B2 US 9000991B2 US 201213686053 A US201213686053 A US 201213686053A US 9000991 B2 US9000991 B2 US 9000991B2
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Prior art keywords
elements
dipole
vivaldi
reflector
antenna assembly
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US13/686,053
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US20140145890A1 (en
Inventor
Henrik Ramberg
Ermin Pasalic
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TE Connectivity Solutions GmbH
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Laird Technologies Inc
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Assigned to LAIRD TECHNOLOGIES, INC. reassignment LAIRD TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PASALIC, ERMIN, RAMBERG, HENRIK
Priority to US13/686,053 priority Critical patent/US9000991B2/en
Priority to CN201380070417.9A priority patent/CN104937775B/zh
Priority to DE212013000228.9U priority patent/DE212013000228U1/de
Priority to DE112013005433.7T priority patent/DE112013005433T5/de
Priority to PCT/US2013/054970 priority patent/WO2014084932A1/en
Priority to BR112015012131A priority patent/BR112015012131A8/pt
Priority to TW102132390A priority patent/TWI521797B/zh
Publication of US20140145890A1 publication Critical patent/US20140145890A1/en
Publication of US9000991B2 publication Critical patent/US9000991B2/en
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Assigned to LAIRD CONNECTIVITY, INC. reassignment LAIRD CONNECTIVITY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAIRD TECHNOLOGIES, INC.
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Assigned to LAIRD CONNECTIVITY HOLDINGS LLC reassignment LAIRD CONNECTIVITY HOLDINGS LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAIRD CONNECTIVITY LLC
Assigned to TE CONNECTIVITY SOLUTIONS GMBH reassignment TE CONNECTIVITY SOLUTIONS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAIRD CONNECTIVITY HOLDINGS LLC
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • H01Q13/085—Slot-line radiating ends
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines

Definitions

  • the present disclosure relates to antenna assemblies including dipole elements and Vivaldi elements.
  • a common way to provide a dual polarized, dual band antenna assembly using only two radiating elements is to use separate radiating elements for the low band and the high band.
  • first and second dipole elements may be respectively used for the low and high bands.
  • an antenna assembly generally includes a first radiating element module operable in at least a first frequency range and a second radiating element module operable in at least a second frequency range that is different than the first frequency range.
  • the first radiating element module includes a plurality of dipole elements arranged in a dipole square.
  • the second radiating element module includes a plurality of Vivaldi elements arranged in a crossed Vivaldi arrangement.
  • a plurality of dipole dements define a perimeter and are operable in at least a first frequency range.
  • First and second Vivaldi elements are within the perimeter defined by the plurality of dipole elements and operable in at least a second frequency range that is different than the first frequency range.
  • the first and second Vivaldi elements are arranged relative to each other to form a cruciform.
  • a plurality of dipole elements are arranged in a dipole square and operable in at least a first frequency range.
  • First and second crossed Vivaldi elements are within a perimeter defined by the dipole square and operable in at least a second frequency range.
  • the first and second Vivaldi elements include one or more electrically nonconductive areas configured for improved cross polarization radiation.
  • FIG. 1 is a perspective view of an exemplary embodiment of an antenna assembly including four dipole elements arranged in a dipole square for low band operation and two crossed Vivaldi elements for high band operation;
  • FIG. 2 is a top view of the antenna assembly 100 shown in FIG. 1 without the radome and showing the dipole and Vivaldi elements;
  • FIG. 3 is a perspective view of the crossed Vivaldi elements shown in FIG. 1 ;
  • FIG. 4 is a view of the Vivaldi elements shown in FIG. 3 laying side-by-side before being assembled together, and illustrating the vertical cutouts for improved cross polarization according to an exemplary embodiment
  • FIG. 5 is an exploded perspective view of the antenna assembly shown in FIG. 1 and illustrating various exemplary components that may be used while assembling the antenna assembly according to an exemplary embodiment
  • FIG. 6 is a perspective view of a pair of dipole elements shown in FIG. 5 ;
  • FIG. 7 is an exploded perspective view showing the Vivaldi elements ready to be assembled together and the isolator/reflector walls ready to be assembled together and disposed between the dipole and Vivaldi elements according to an exemplary embodiment
  • FIG. 8 is an exploded perspective view showing the radome aligned for positioning over the dipole and Vivaldi elements and for attachment to the base of the antenna assembly according to an exemplary embodiment
  • FIG. 9 are front and side views of the radome shown in FIG. 1 with exemplary dimensions in millimeters provided for purpose of illustration only according to an exemplary embodiment
  • FIGS. 10A and 10B are exemplary line graphs respectively illustrating voltage standing wave ratio (VSWR) versus frequency in gigahertz (GHz) for port1 and port2 of a prototype or FAI (first article of inspection) sample of the antenna assembly shown in FIG. 1 ; and
  • FIG. 11 is an exemplary line graph respectively illustrating voltage isolation in decibels (dB) versus frequency in gigahertz (GHz) for the isolation between port1 and port2 of the same prototype of the antenna assembly shown in FIG. 1 .
  • the inventor hereof has recognized that it is difficult to develop or design an antenna element that is dual polarized, dual band, and has acceptable radiation patterns. Typically, an antenna element that provides dual band performance is usually not suitable for a dual polarized application and/or has radiation patterns that are not acceptable. After recognizing the above, the inventor hereof sought to develop antenna assemblies having separate radiating elements for the low and high bands in which the low and high band elements for each polarization are combined with a diplexing feed network.
  • an antenna assembly includes four dipole elements configured or arranged in a dipole square and operable in a first frequency range or low band (e.g., including frequencies from 698 MHz to 960 MHz, etc.).
  • a pair of Vivaldi elements are positioned within the low band dipole square.
  • the pair of Vivaldi elements are crossed or arranged in a cruciform and operable in a second frequency range or high band (e.g., including frequencies from 1710 MHz to 2700 MHz, etc.).
  • the high and low band elements are combined for each polarization with a diplex feed network.
  • exemplary embodiments may thus provide dual polarized dual band antenna assemblies having separate radiating element modules or assemblies (e.g., a square dipole element module and a crossed Vivaldi element module, etc.) for the low and high bands that are combined for each polarization with a diplexing feed network and that provides acceptable radiation patterns.
  • separate radiating element modules or assemblies e.g., a square dipole element module and a crossed Vivaldi element module, etc.
  • the Vivaldi elements may include cutouts on the vertical side for improved cross polarization radiation.
  • the Vivaldi elements (with the cutout) together with the low band dipole square elements provide a more broadband antenna with good dual polarization and good radiation pattern performance.
  • FIG. 1 illustrates an exemplary embodiment of an antenna assembly 100 embodying one or more aspects of the present disclosure.
  • the antenna assembly 100 includes a first radiating element module operable in at least a first frequency range or low band, and a second radiating element module operable in at least a second frequency range or high band.
  • the first radiating element module includes first, second, third, and fourth dipole elements 102 , 104 , 106 , 108 arranged in a dipole square.
  • the second radiating element module includes first and second Vivaldi elements 110 , 112 arranged in a crossed Vivaldi arrangement.
  • the first radiating element module and its dipole elements 102 , 104 , 106 , 108 are operable for transmitting and receiving electromagnetic radiation or signals in the first frequency range or low band (e.g., including frequencies from 698 MHz to 960 MHz, etc.) with two linear orthogonal polarizations (e.g., dual linear slant +/ ⁇ 45 degree or horizontal and vertical polarizations).
  • first frequency range or low band e.g., including frequencies from 698 MHz to 960 MHz, etc.
  • two linear orthogonal polarizations e.g., dual linear slant +/ ⁇ 45 degree or horizontal and vertical polarizations.
  • the second radiating element module and its crossed Vivaldi elements 110 , 112 are operable for transmitting and receiving electromagnetic radiation or signals in the second frequency range or high band (e.g., including frequencies from 1710 MHz to 2700 MHz, etc.) also with two linear orthogonal polarizations (e.g., dual linear slant +/ ⁇ 45 degree or horizontal and vertical polarizations).
  • the radiating elements are configured to radiate with dual linear slant +/ ⁇ 45 degree orthogonal polarizations.
  • the radiating elements are configured to radiate with horizontal and vertical orthogonal polarizations.
  • the four dipole elements 102 , 104 , 106 , 108 are positioned at right angles relative to one another.
  • the four dipole elements 102 , 104 , 106 , 108 are arranged in a dipole square with the dipole elements 102 , 104 , 106 , 108 generally oriented in an orientation or aligned in an alignment of +/ ⁇ 45 degrees with respect to a vertical.
  • Dipole elements 102 and 104 are also shown in FIG. 6 , along with feed probes 103 , 105 and feed line spacers 107 .
  • the feed probes 103 , 105 may pass through openings (e.g., holes, slots, etc.) of the second or outer reflector 130 and through openings (e.g., holes, slots, etc.) of the PCB 113 for connection (e.g., solder, etc.) to a feed network.
  • the feed line spacers 107 may be attached by using adhesive, e.g., using Loctite adhesive, etc.
  • the crossed Vivaldi elements 110 , 112 are arranged or positioned internally or within a perimeter or footprint defined by the dipole square formed by the dipole elements 102 , 104 , 106 , 108 .
  • the pair of Vivaldi elements 110 , 112 are crossed and oriented generally perpendicularly or orthogonally to each other, such that the Vivaldi elements 110 , 112 are configured in a cruciform ( FIG. 3 ).
  • the Vivaldi elements 110 , 112 includes slots or notches 115 for slidably receiving a portion of the other Vivaldi element 110 , 112 therein.
  • the Vivaldi elements 110 , 112 also include grounding portions or tabs 117 configured to be positioned through openings (e.g., holes, slots, etc.) in the reflector 130 and then electrically connected (e.g., soldered, etc.) and grounded to corresponding grounding portions of the PCB 113 .
  • the Vivaldi elements 110 , 112 also include probes 119 printed on their respective PCBs.
  • the probes 119 are configured to be positioned through openings (e.g., holes, slots, etc.) in the reflector 130 and openings (e.g., holes, slots, etc.) in the PCB 113 to be electrically connected (e.g., soldered, etc.) to a feed network. At least a portion (e.g., a backside, etc.) of each probe 119 is grounded to the PCB 113 .
  • the Vivaldi elements 110 , 112 are aligned parallel or perpendicularly to the corresponding dipole elements 102 , 104 , 106 , 108 .
  • the Vivaldi element 110 is perpendicular to the dipole elements 102 , 104 and parallel to the dipole elements 106 , 108 .
  • the Vivaldi element 112 is parallel to the dipole elements 102 , 104 and perpendicular to the dipole elements 106 , 108 .
  • Each pair of dipole elements that are directly across from each other are fed in phase (e.g., via a diplexing feed network, etc.) and radiate with the same linear polarization.
  • the dipole elements 102 , 104 are fed in phase with each other and may radiate with either horizontal or vertical polarization, or they may radiate with a slant +45 degree or ⁇ 45 degree linear polarization.
  • the other dipole elements 106 , 108 are also fed in phase with each other but may radiate with the other linear polarization that is orthogonal to the polarization in which the dipole elements 102 , 104 radiate.
  • the dipole elements 102 , 104 may radiate with horizontal polarization, while the other dipole elements 106 , 108 radiate with vertical polarization.
  • the dipole elements 102 , 104 provide low band operation with horizontal polarization, while the dipole elements 106 , 108 provide low band operation with vertical polarization.
  • the dipole elements 102 , 104 may provide low band operation with vertical polarization, while the dipole elements 106 , 108 may provide low band operation with horizontal polarization.
  • the first radiating element module and its dipole elements 102 , 104 , 106 , 108 are operable for transmitting and receiving electromagnetic radiation or signals in the first frequency range with horizontal and vertical polarizations.
  • the dipole elements 102 , 104 may radiate with a +45 degree linear polarization.
  • the other dipole elements 106 , 108 may radiate with a ⁇ 45 degree linear polarization, which is orthogonal to the +45 degree polarization in which the dipole elements 102 , 104 radiate.
  • the dipole elements 102 , 104 provide low band operation with the +45 degree linear polarization, while the dipole elements 106 , 108 provide low band operation with the ⁇ 45 degree linear polarization.
  • the dipole elements 102 , 104 may provide low band operation with the ⁇ 45 degree linear polarization, while the dipole elements 106 , 108 may provide low band operation with the +45 degree linear polarization.
  • the first radiating element module and its dipole elements 102 , 104 , 106 , 108 are operable for transmitting and receiving electromagnetic radiation or signals in the first frequency range with dual slant +/ ⁇ 45 degree linear orthogonal polarizations.
  • the crossed Vivaldi elements 110 , 112 have orthogonal polarizations relative to each other (e.g., dual linear slant +/ ⁇ 45 degree orthogonal polarizations or horizontal and vertical polarizations).
  • the crossed Vivaldi elements 110 , 112 include radiating elements 124 on one side of their respective substrates 126 .
  • the radiating elements 124 are configured such that there are electrically nonconductive areas 128 (e.g., cut outs, slots, etc.), which help significantly improve cross polarization according to an exemplary embodiment.
  • Vivaldi elements 110 , 112 together with the low band dipole square elements 102 , 104 , 106 , 108 make it possible to achieve a more broadband antenna with good dual polarized and radiation pattern performance.
  • the nonconductive areas or cut outs 128 comprise areas on the substrates 126 without electrically-conductive material (e.g., copper traces, copper metallization, etc.) thereon.
  • the nonconductive areas or cut outs 128 may comprise areas on the substrates 126 at which the electrically-conductive material forming the radiating elements 124 has been etched, cut, or otherwise removed.
  • the nonconductive areas or cut outs 128 have a generally semi oval or half oval shape, and the radiating elements 124 have a generally crescent shape.
  • Alternative embodiments may include nonconductive areas, cut outs, and/or radiating elements that are shaped differently.
  • the Vivaldi elements 110 , 112 may radiate with linear orthogonal polarizations relative to each other.
  • the Vivaldi element 110 may radiate with a horizontal polarization, while the other Vivaldi element 112 may radiate with a vertical polarization.
  • the Vivaldi element 110 may instead radiate with a vertical polarization, while the other Vivaldi element 112 may radiate with a horizontal polarization.
  • the second radiating element module and its crossed Vivaldi elements 110 , 112 are operable for transmitting and receiving electromagnetic radiation or signals in the second frequency range with horizontal and vertical polarizations.
  • the Vivaldi element 110 may radiate with a +45 degree linear polarization, while the other Vivaldi element 112 may radiate with a ⁇ 45 degree linear polarization.
  • the Vivaldi element 110 may instead radiate with a ⁇ 45 degree linear polarization, while the other Vivaldi element 112 may radiate with a +45 degree linear polarization.
  • the second radiating element module and its crossed Vivaldi elements 110 , 112 are operable for transmitting and receiving electromagnetic radiation or signals in the second frequency range with dual slant +/ ⁇ 45 degree linear orthogonal polarizations.
  • the antenna assembly 100 also includes a diplex feed network.
  • the diplex feed network is operable for combining the low and high band elements for each polarization.
  • the diplex feed network comprises one diplex filter per port, and the diplexer is made of microstripe lines on a PCB for this example. This is but one example that may be used with the antenna assembly 100 , as other types of feeds may be used in other embodiments.
  • Alternative feed networks may also be used, such as other microstrip transmission lines, serial or corporate feeding networks, etc.
  • the high band crossed Vivaldi elements 110 , 112 are isolated from the low band dipole elements 102 , 104 , 106 , 108 by an isolator or reflector 114 in which the cross Vivaldi elements 110 , 112 are positioned.
  • the isolator or reflector 114 also helps to shape the beam, or is a beam shaper for the Vivaldi elements 110 , 112 .
  • the isolator or reflector 114 includes four walls 116 , 118 , 120 , 122 defining a generally rectangular (e.g., square, etc.) shape that corresponds to the shape of the dipole square defined by the dipole elements 102 , 104 , 106 , 108 .
  • Each wall 116 , 118 , 120 , 122 is disposed along or adjacent to a corresponding one of the dipole elements 102 , 104 , 106 , 108 so as to be positioned generally between the corresponding dipole element and the crossed Vivaldi elements 110 , 112 .
  • the isolator or reflector 114 is generally square so as to match the shape of the dipole square.
  • Alternative embodiments may include a dipole element module or assembly and an isolator or reflector that are shaped differently than square, e.g., non-square rectangular shape, etc.
  • the antenna assembly 100 further includes an outer reflector 130 .
  • the reflector 130 includes eight sidewalls defining a generally octagonal shape, which may help the antenna assembly 100 fit within a smaller, more aesthetic radome 152 .
  • the sidewalls extend generally perpendicular to the bottom wall of the reflector 130 .
  • the reflector 130 helps to improve the front-to-back (f/b) radiation by lowering the energy that goes back.
  • the reflector 130 helps to reflect and direct signals from the radiating elements of the antenna assembly 100 in an outward direction. For example, the reflector 130 helps to reflect and direct signals downward when the antenna assembly 100 is mounted to a ceiling for downward looking radiation.
  • the reflector 130 helps to reflect and direct signals upward when the antenna assembly 100 is placed on a surface facing upwards for upward looking radiation.
  • Alternative embodiments may include an outer reflector that is shaped differently than octagonal, such as square, rectangular, etc.
  • another exemplary embodiment of the antenna assembly 100 may include a square reflector, which may help improve performance.
  • the antenna assembly 100 includes first and second ports 132 , 134 .
  • the ports 132 , 134 include corresponding electrical connectors ( FIG. 5 ) configured for a pluggable connection to another device for communicating signals between the antenna assembly 100 and the another device.
  • This exemplary configuration includes the use of N-connectors.
  • Other exemplary types of electrical connections may also be used including coaxial cable connectors, ISO standard electrical connectors, Fakra connectors, SMA connectors, an I-PEX connector, a MMCX connector, etc.
  • the antenna assembly 100 may be used as a two-port indoor directional antenna.
  • FIG. 5 illustrates the antenna assembly 100 having exemplary coaxial cables 133 , 135 that are connectable to the connectors at the respective ports 132 , 134 .
  • Other embodiments may include different means for communicating signals to/from the antenna assembly 100 .
  • the dipole elements 102 , 104 may radiate with a polarization orthogonal to the polarization of the other dipole elements 106 , 108 , e.g., horizontal and vertical polarizations or dual slant +/ ⁇ 45 degree linear orthogonal polarizations.
  • the Vivaldi elements 110 , 112 may also radiate with linear orthogonal polarizations relative to each other, e.g., horizontal and vertical polarizations or dual slant +/ ⁇ 45 degree linear orthogonal polarizations.
  • the antenna assembly 100 may thus be operable for producing linear polarized coverage for one of the two ports 132 , 134 in the first and second frequency ranges and for producing linear polarized coverage for the other port 132 or 134 in the first and second frequency ranges, such that the polarizations associated with the ports 132 , 134 are orthogonal to each other. Accordingly, this exemplary embodiment of an antenna assembly 100 therefore has a dual-polarized design (e.g., dual linear +/ ⁇ 45 degree antenna design), which may also provide, e.g., via the reflector/isolator 114 reduced coupling of the radiating antenna elements. Having radiating antenna elements with a polarization that is orthogonal to the polarization of other radiating elements may also enhance MIMO (multiple input, multiple output) performance through polarization diversity. Alternative embodiments may include more or less than two ports.
  • the illustrated antenna assembly 100 further includes a chassis or base 148 (broadly, a support member) and a radome or housing 152 removably mounted to the chassis 148 .
  • the radome 152 may help protect the various antenna components enclosed within the internal space defined by the radome 152 and chassis 148 .
  • the radome 152 may also provide an aesthetically pleasing appearance to the antenna assembly 100 .
  • Other embodiments may include radomes and covers configured (e.g., shaped, sized, constructed, etc.) differently than disclosed herein within the scope of the present disclosure.
  • the radome 152 may be attached to the chassis 148 by mechanical fasteners (e.g., screws 156 and O-rings 158 ( FIG. 5 ), other fastening devices, etc.).
  • a sealing member 159 e.g., elastomeric sealing member, 3M sealant, etc.
  • the radome 152 may be snap fit to the chassis 148 or via other suitable fastening methods/means within the scope of the present disclosure.
  • the radome 152 may have a height or thickness of 82 millimeters (mm) and a length and width of 295 millimeters.
  • Alternative embodiments may include a radome with a different configuration, such as a different shape and/or different size.
  • an exemplary embodiment includes aluminum dipole elements 102 , 104 , 106 , 108 and aluminum reflectors 114 and 130 .
  • the substrates 126 of the Vivaldi elements 110 , 112 may be FR4, which is a composite material of woven fiberglass cloth with an epoxy resin binder that is flame resistant.
  • the Vivaldi radiating elements 124 may be copper (e.g., copper traces on a printed circuit board, copper metallization, etc.).
  • the chassis 148 which may also or instead be referred to as a ground plane
  • radome 152 is injection molded plastic or vacuum formed out of thermoplastic
  • the chassis or ground plane 148 is electrically conductive (e.g., aluminum, etc.) for electrically grounding the radiating antenna elements.
  • Alternative embodiments may include other one or more components formed from other electrically-conductive materials (e.g., other metals besides aluminum and copper, etc.) and/or other dielectric materials for the Vivaldi substrate besides FR4.
  • other exemplary embodiments may be configured to be operable in more than two bands and/or different frequency bands.
  • FIGS. 5 through 8 illustrate various exemplary components that may be used while assembling the antenna assembly 100 according to an exemplary embodiment. These exemplary components and the accompanying assembly process are provided for purpose of illustration only as alternative embodiments may include different components (e.g., different fasteners and/or seals, etc.) and/or be assembled by a different process.
  • FIG. 5 further illustrates the following additional components that may be used.
  • mechanical fasteners e.g., screws 160 , etc.
  • Mechanical fasteners e.g., screws 161 , etc.
  • Adhesive 162 may be positioned between the PCB 113 and reflector 130 , to thereby adhesively attach the PCB 113 to the bottom of the reflector 130 .
  • FIG. 5 further illustrates standoffs 163 that may be fastened between the dipole elements 102 , 104 , 106 , 108 and the reflector 130 via mechanical fasteners, e.g., threaded pem studs 164 and nuts 165 , etc.
  • adhesive 166 e.g., four adhesive tapes, pads, strips, pieces, etc.
  • Adhesive 167 e.g., two adhesive pads, strips, pieces, etc.
  • mechanical fasteners e.g., rivets 168 , etc.
  • the walls 118 , 120 are formed from a single piece
  • walls 116 , 122 are formed from a second single piece.
  • the isolator/reflector 114 does not include any bottom wall as the walls 116 , 118 , 120 , 122 may be mounted or attached to the reflector 130 via the adhesive 166 and mechanical fasteners 160 . Cable connector grounds 169 are also shown in FIG. 5 .
  • pem studs 164 are first pressed into openings or holes in the bottom wall of the octagonal reflector 130 from the bottom.
  • Adhesive e.g., Loctite 380 adhesive, etc.
  • Loctite 380 adhesive etc.
  • the feed probes 103 , 105 are mounted to the corresponding dipoles via the feed line spacers 107 .
  • the spacers 107 are slotted to the probes 103 , 105 through the small cut-outs of the spacers 107 .
  • An open probe end may be used in other embodiments.
  • the feed line spacers 107 are attached by using adhesive. For example, Loctite 403 adhesive may be applied to the portions of the feed line spacers 107 that contact the probes 103 , 105 and the portions of the feed line spacers 107 that contact the dipole areas.
  • the dipole elements 102 , 104 , 106 , 108 are mounted to the reflector 130 using mechanical fasteners 161 (e.g., using 12 MRT-TTscrews, etc.), which may be tightened (e.g., 75 Newton-centimeter (N-cm), etc.) with an appropriate torque wrench tooling.
  • mechanical fasteners 161 e.g., using 12 MRT-TTscrews, etc.
  • N-cm Newton-centimeter
  • the top threaded portions of the standoffs 163 extend through holes 170 ( FIG. 6 ) in the dipole areas.
  • Hex nuts 165 are then screwed (e.g., 8 N-cm, etc.) onto those threaded portions of the standoffs 163 that extend through the holes 170 .
  • Adhesive e.g., Loctite 380 adhesive, etc.
  • Loctite 380 adhesive etc.
  • the reflector 114 may next be assembled by first applying adhesive 167 to the outside of the small flanges on the reflector walls 116 , 118 as shown in FIGS. 5 and 7 .
  • the walls 116 and 122 are then assembled to each other using a rivet 168 and an appropriate rivet tool.
  • the walls 118 and 120 are assembled to each other using a rivet 168 and an appropriate rivet tool.
  • Adhesive 166 e.g., four adhesive tapes, pads, strips, pieces, etc. is applied to bottom flanges of the reflector walls 116 , 118 , 120 , 122 to attach the walls to the reflector 130 .
  • the bottom flanges of the reflector walls 116 , 118 , 120 , 122 are shaped similarly to the shape to the corresponding adhesive piece applied thereto.
  • a fixture is used in order to help ensure an exact or more accurate positioning of the walls 116 , 118 , 120 , 122 relative to the reflector 130 .
  • Adhesive 162 is mounted and attached to the PCB 113 , and used to mount the PCB 113 to the reflector 130 .
  • a guiding fixture may be used as necessary during this operation of mounting the PCB 113 to the reflector 130 .
  • the PCBs of the Vivaldi elements 110 , 112 are positioned relative to the reflector 130 such that the Vivaldi grounding portions or tabs 117 are positioned through openings (e.g., holes, slots, etc.) in the reflector 130 . Then, the grounding portions 117 are electrically connected (e.g., soldered, etc.) to corresponding grounding portions of the PCB 113 , to thereby ground the Vivaldi elements 110 , 112 to the PCB 113 .
  • the probes 119 of the Vivaldi elements 110 , 112 are positioned through openings (e.g., holes, slots, etc.) in the reflector 130 and also through openings (e.g., holes, slots, etc.) in the PCB 113 . Then, the probes 119 are electrically connected (e.g., soldered, etc.) to a feed network.
  • the Vivaldi PCBs may be pushed (e.g., via the non-copper side, etc.) against the reflector 130 in order to ensure correct positioning.
  • this exemplary embodiment includes a total of eight grounding tabs 117 .
  • Coaxial cables 133 , 135 are soldered to the connectors 132 , 134 , for example, by using a resistance soldering tool after removing the O-rings from the connectors to prevent melting during the soldering process.
  • the coaxial cables 133 , 135 are preferably formed in a specially designed fixture in order to match the shape of the cavities in the base 148 .
  • the braids of the coaxial cables 133 , 135 are soldered to the cable connector grounds 169 .
  • the center conductors of the coaxial cables 133 , 135 are soldered to the PCB 113 .
  • the removed O-rings are inserted or added back onto the connectors 132 , 134 .
  • the connectors 132 , 134 are pulled through holes of the base 148 .
  • Screws 160 may then be tightened (e.g., with torque of 50 N-cm, etc.) to thereby attach the reflector 130 to the base 148 .
  • a washer and nut may be assembled onto the connectors 132 , 134 and tightened (e.g., to 150 N-cm with torque wrench tool, etc.).
  • the connectors 132 , 134 face downward when the antenna assembly 100 is in the upright position.
  • Sealant (e.g., 3M sealant 5200 FC, etc.) is applied circumferentially to an inner surface of the radome 152 along the entire perimeter of the radome 152 , e.g., five millimeters from the bottom of the radome 152 , etc. Sealant may also be applied along an perimeter edge of the base 148 .
  • the radome 152 is mounted to the base 148 using screws 156 and O-rings 158 , which screws 156 may be tightened with torque of 75 N-cm, etc.
  • the sealant is allowed to cure horizontally with the connectors facing downward.
  • One or more labels may be applied to the bottom of the base 148 .
  • FIGS. 10A , 10 B, and 11 provide analysis results measured for a prototype or FAI (first article of inspection) sample of the antenna assembly 100 shown in FIG. 1 . These analysis results are provided only for purposes of illustration and not for purposes of limitation.
  • FIGS. 10A and 10B are exemplary line graphs respectively illustrating voltage standing wave ratio (VSWR) versus frequency in gigahertz (GHz) for port1 and port 2 of a prototype or FAI (first article of inspection) sample of the antenna assembly 100 .
  • FIG. 11 is an exemplary line graph respectively illustrating isolation in decibels (dB) versus frequency in gigahertz (GHz) for the isolation between port1 and port2 of the same prototype of the antenna assembly 100 .
  • FIGS. 10A and 10B show that the antenna assembly 100 had a good VSWR of less than 2 for frequencies within a first frequency range or low band including frequencies from 698 MHz to 960 MHz and within a second frequency range or high band including frequencies from 1710 MHz to 2700 MHz.
  • the VSWR for port1 was 1.1593 at 698 MHz, 1.5925 at 960 MHz, 1.3646 at 1710 MHz, and 1.5630 at 2700 MHz.
  • the VSWR for port2 was 1.3057 at 698 MHz, 1.5150 at 960 MHz, 1.4227 at 1710 MHz, and 1.5427 at 2700 MHz.
  • FIG. 11 generally shows that the antenna assembly 100 has good isolation between port1 and port2 for the low band including frequencies from 698 MHz to 960 MHz and the high band including frequencies from 1710 MHz to 2700 MHz.
  • the isolation between port1 and port2 was ⁇ 33.510 dB at 698 MHz, ⁇ 35.989 dB at 960 MHz, ⁇ 29.277 dB at 1710 MHz, and ⁇ 39.025 dB at 2700 MHz.
  • Azimuth plane radiation patterns were also measured for the first and second ports of the same prototype of the antenna assembly 100 at various frequencies. The results are summarized in the table below for the first and second ports respectively referred to as Port1 and Port2 in the table.
  • the radiation pattern test results show that the antenna assembly 100 has a bandwidth spread of 56° to 71° for the low band from 698 MHz to 960 MHz and 48° to 81° for the high band from 1710 MHz to 2700 MHz.
  • the gain (+/ ⁇ 0.5 decibels (dB)) was 8.2 dB to 9.7 dB for the low band and 5.7 dB to 9.5 dB for the high band.
  • the front to back ratio was greater than 16.9 dB for the low band, and only the frequency 1880 MHz had a front to back ratio less than 15 dB for the high band.
  • this testing shows that the antenna assembly 100 has good bandwidth spread, good gain, and good directivity with a high front to back ratio for the low band from 698 MHz to 960 MHz and the high band from 1710 MHz to 2700 MHz.
  • An FAI sample or prototype of the antenna assembly 100 or other antenna assembly disclosed herein may have other values for the VSWR for port1 and port2 and/or other values for the isolation between port1 and port2.
  • a second prototype or FAI sample of the antenna assembly 100 was created and tested.
  • the second sample also had a good VSWR of less than 2, good isolation, good bandwidth spread, good gain, and good directivity with a high front to back ratio for frequencies within a low band from 698 MHz to 960 MHz and for frequencies within a high band from 1710 MHz to 2700 MHz.
  • the VSWR for port1 was 1.1487 at 698 MHz, 1.6547 at 960 MHz, 1.3517 at 1710 MHz, and 1.6924 at 2700 MHz.
  • the VSWR for port2 was 1.1846 at 698 MHz, 1.5385 at 960 MHz, 1.6558 at 1710 MHz, and 1.3966 at 2700 MHz.
  • the isolation between port1 and port2 was ⁇ 36.612 dB at 698 MHz, ⁇ 39,832 dB at 960 MHz, ⁇ 28.034 dB at 1710 MHz, and ⁇ 28.615 dB at 2700 MHz.
  • the bandwidth spread was 57° to 71° for the low band and 48° to 78° for the high band.
  • the gain (+/ ⁇ 0.5 decibels (dB)) was 8.2 dB to 9.7 dB for the low band from 698 MHz to 960 MHz and 6.1 dB to 9.8 dB for the high band from 1710 MHz to 2700 MHz.
  • the front to back ratio was greater than 16.9 dB for the low band, and only the frequency 1880 MHz had a front to back ratio less than 15 dB for the high band.
  • an antenna assembly may be housed in a relatively low profile ceiling-mountable or tabletop appropriate package.
  • an antenna assembly disclosed herein may include ceiling/wall mounting clips and/or other means (e.g., mechanical fasteners, adhesives, frame-style mounts, etc.) for mounting and suspending the antenna assembly from a ceiling or other suitable structure.
  • an antenna assembly disclosed herein may be used in systems and/or networks such as those associated with wireless internet service provider (WISP) networks, broadband wireless access (BWA) systems, wireless local area networks (WLANs), cellular systems, etc.
  • WISP wireless internet service provider
  • BWA broadband wireless access
  • WLANs wireless local area networks
  • the antenna assemblies may receive and/or transmit signals from and/or to the systems and/or networks within the scope of the present disclosure.
  • Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms, and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
  • Spatially relative terms such as “inner,” “outer,” “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
US13/686,053 2012-11-27 2012-11-27 Antenna assemblies including dipole elements and Vivaldi elements Active 2033-11-05 US9000991B2 (en)

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US13/686,053 US9000991B2 (en) 2012-11-27 2012-11-27 Antenna assemblies including dipole elements and Vivaldi elements
CN201380070417.9A CN104937775B (zh) 2012-11-27 2013-08-14 包括偶极振子元件和维瓦尔第元件的天线组件
DE212013000228.9U DE212013000228U1 (de) 2012-11-27 2013-08-14 Antennenanordnungen mit Dipolelementen und Vivaldi-Elementen
DE112013005433.7T DE112013005433T5 (de) 2012-11-27 2013-08-14 Antennenanordnungen mit Dipolelementen und Vivaldi-Elementen
PCT/US2013/054970 WO2014084932A1 (en) 2012-11-27 2013-08-14 Antenna assemblies including dipole elements and vivaldi elements
BR112015012131A BR112015012131A8 (pt) 2012-11-27 2013-08-14 montagem de antena que inclui elementos dipolo e elementos vivaldi
TW102132390A TWI521797B (zh) 2012-11-27 2013-09-09 包含偶極元件與韋瓦第元件之天線組件

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BR112015012131A2 (pt) 2017-07-11
TW201421803A (zh) 2014-06-01
TWI521797B (zh) 2016-02-11
DE212013000228U1 (de) 2015-07-01
BR112015012131A8 (pt) 2019-10-01
CN104937775B (zh) 2017-07-11
DE112013005433T5 (de) 2015-07-30
CN104937775A (zh) 2015-09-23
US20140145890A1 (en) 2014-05-29
WO2014084932A1 (en) 2014-06-05

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